摘要
在资源有限的嵌入式GIS环境中,地图符号的绘制速度决定了矢量地图的显示速度。提出了一种基于模板的嵌入式GIS地图符号快速绘制算法,先建立基于模板的地图符号库,在地图符号绘制算法中用查表代替三角函数运算,用定点运算代替浮点运算,使地图显示速度显著提高。试验表明,用该算法可使地图显示速度提高3倍以上。
Limited to the resource in the embedded GIS, the drawing speed of map symbols determined the display speed of vector graphics. A quick drawing algorithm for map symbols based on the template in the embed ded GIS was researched. On the basis of installation the map symbols database based on the template, arccosine calculation was replaced by searching for table, floating point arithmetic was replaced by fixed point arithmetic, which made the speed of display improved rapidly. The result showed that the display speed was more than tree times as before.
出处
《测绘科学技术学报》
北大核心
2009年第5期330-332,共3页
Journal of Geomatics Science and Technology
关键词
模板
嵌入式GIS
地图符号
浮点运算
定点运算
template
embedded GIS
map symbol
fixed point arithmetic
floating point arithmetic
